CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Apr. 27, 2018	Apr. 28, 2017	Apr. 29, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 76	$ 509	$ 229
Other comprehensive income (loss):
Foreign currency translation adjustments	2	(10)	4
Defined benefit obligations:
Defined benefit obligation adjustments	1	25	(7)
Reclassification adjustments related to defined benefit obligations	(2)	1	2
Income tax effect	1	(10)	2
Unrealized gains (losses) on available-for-sale securities:
Unrealized holding losses arising during the period	(43)	(6)	(4)
Reclassification adjustments for gains included in net income	0	0	(1)
Unrealized gains (losses) on cash flow hedges:
Unrealized holding gains (losses) arising during the period	0	8	(4)
Reclassification adjustments for (gains) losses included in net income	0	(6)	1
Other comprehensive income (loss):	(41)	2	(7)
Comprehensive income	$ 35	$ 511	$ 222